Initialize the web cam

private CaptureSource _captureSource;
private VideoBrush _videoBrush;
private ImageBrush _imageBrush;

_captureSource = new CaptureSource();
_captureSource.CaptureImageCompleted += (o, e) =>
{
    _imageBrush = new ImageBrush();
    _imageBrush.ImageSource = e.Result;
    rectWebCamView.Fill = _imageBrush;
};
_captureSource.CaptureFailed += (o, e) =>
{
    MessageBox.Show(e.ErrorException.Message);
};

Start the web cam, the rectWebCamView is a Rectangle.

if (_captureSource.State != CaptureState.Started)
{
    _captureSource.VideoCaptureDevice =
        CaptureDeviceConfiguration.GetDefaultVideoCaptureDevice();
    _videoBrush = new VideoBrush();
    _videoBrush.SetSource(_captureSource);
    rectWebCamView.Fill = _videoBrush;

    if (CaptureDeviceConfiguration.RequestDeviceAccess())
    {
        _captureSource.Start();
    }
}

The RequestDeviceAccess() method invokes a request dialog for accessing the webcame like this.

Request Access dialog

Note: The RequestAccess must be called in response to a user initiated event, such as a Button Click event.

Stop the web cam

_captureSource.Stop();

And finally the capture image.

if (_captureSource.State == CaptureState.Started)
{
    _captureSource.CaptureImageAsync();
}

The method will invoke CaptureImageCompleted event, and which will capture the image and display it in the rectangle. The XAML code contains only 3 buttons and one rectangle, so I am not posting the XAML code.

Happy programming

JustDecompile is a new, free developer productivity tool designed to enable easy .NET assembly browsing and decompiling. In the past it has only worked with .NET assemblies, but today it also works with Silverlight XAP files. I’m going to walk you through a sample of using this functionality.

You can download the JustDecompile from here.

And here is screenshot of JustDecompile running on my system.

Telerik JustDecompile Beta

It is still in beta stage. So I don’t think it is not in state where we can compare this with other .net decompilers available in the market.

Happy Programming.

OpenFileDialog openFileDialog = new OpenFileDialog();
//Hard coding filter - You can read it from client side too.
openFileDialog.Filter = "Image Files|*.jpg;*.bmp;*.png";
openFileDialog.Multiselect = true;
bool? result = openFileDialog.ShowDialog();
if (result.HasValue && result.Value)
{
    spProgress.Visibility = System.Windows.Visibility.Visible;

    Service1Client client = new Service1Client();
    client.DoUploadCompleted += (o, p) =>
    {
        if (p.Error != null)
        {
            MessageBox.Show(p.Error.Message);
        }
        else
        {
            MessageBox.Show("Done");
        }
    };
    client.DoUploadAsync(CreateUploadData(openFileDialog.Files));
    client.CloseAsync();
}

And here is the helper methods.

private Dictionary<string, byte[]> CreateUploadData(IEnumerable<FileInfo> infos)
{
    var files = new Dictionary<string, byte[]>();
    foreach (var fileInfo in infos)
    {
        files.Add(fileInfo.Name, ReadFileContents(fileInfo.OpenRead()));
    }

    return files;
}

private byte[] ReadFileContents(Stream stream)
{
    using (Stream sr = stream)
    {
        byte[] contents = new byte[sr.Length];
        sr.Read(contents, 0, contents.Length);
        return contents;
    }
}

And here is the change in WCF Service.

[OperationContract]
public void DoUpload(Dictionary<string, byte[]> files)
{
    string folder = @"C:\Uploads";
    foreach (var file in files)
    {
        using (FileStream sw = File.OpenWrite(Path.Combine(folder, file.Key)))
        {
            sw.Write(file.Value, 0, file.Value.Length);
        }
    }
    return;
}

Sometimes if you are uploading too many files with large size, you may get some error like Not Found, maxArrayLength exceeded. You can fix this error by addingin the web.config file.

The final Silverlight 5 release will be available in 2011. You can find more details and can download the beta version from here

Here is a sample implementation, which displaying RSS feeds in a WPF application.

private void cmdRead_Click(object sender, RoutedEventArgs e)
{
    WebClient client = new WebClient();
    client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(client_DownloadStringCompleted);
    client.DownloadStringAsync(new Uri(this.txtUrl.Text));
}

private void client_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
    XmlReader reader = XmlReader.Create(new StringReader(e.Result));
    SyndicationFeed feed = SyndicationFeed.Load(reader);
    this.lstBox.ItemsSource = feed.Items;
}

private void linkUrl_Click(object sender, RoutedEventArgs e)
{
    string url = (e.Source as Hyperlink).NavigateUri.AbsoluteUri;
    Process.Start(url);
}

And here is the WPF – XAML

<Window x:Class="RssReader.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="*" />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>
        <Grid Grid.Row="0">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="Auto" />
                <ColumnDefinition Width="*" />
                <ColumnDefinition Width="Auto" />
            </Grid.ColumnDefinitions>
            <TextBlock Grid.Column="0">URL</TextBlock>
            <TextBox Name="txtUrl" Grid.Column="1" />
            <Button Content="Read" Name="cmdRead" Click="cmdRead_Click" Grid.Column="2" />
        </Grid>
        <ListBox Name="lstBox" Grid.Row="1">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <StackPanel>
                        <TextBlock Text="{Binding Path=Title.Text}" />
                        <TextBlock TextAlignment="Justify" Text="{Binding Path=Summary.Text}" />

                        <TextBlock>
                            <Hyperlink Name="linkUrl" Click="linkUrl_Click" NavigateUri="{Binding Path=Id}">
                                <Label Content="{Binding Path=Title.Text}" ></Label>
                            </Hyperlink>
                        </TextBlock>
                    </StackPanel>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
        <StatusBar Grid.Row="2">
            <StatusBarItem Content="Welcome to RSS Reader" />
        </StatusBar>
    </Grid>
</Window>

This is a basic implementation, you can add more features like multiple urls, settings etc. You can developing a RSS client in silverlight with the same code, but the problem with silverlight is we require a crossdomainpolicy.xml file in the server. If the file is not found it will throw security exception.

Happy Programming.